Data



Data Notes



Extracted from Database

14 Oct 2019

SOMA

Station Information

Station ID: 1345
Latitude: 37.830833
Longitude: 140.962222
Coastline code: 642
Station code: 36
Country: JAPAN
Time span of data: 1973 – 2018
Completeness (%): 96
Link to ellipsoid: Available
Date of last update: 12 Feb 2019

Green Arrow: Current Station
Yellow Marker: Neighbouring RLR Station
Red Marker: Neighbouring Metric Station

Please note: In many cases, the station position in our database is accurate to only one minute. Thus, the tide gauge may not appear to be on the coast.

Tide Gauge Data

Plot of monthly mean sea level data at SOMA.

Link to larger image of monthly data plot.
Download monthly mean sea level data.

Plot of annual mean sea level data at SOMA.

Link to larger image of annual data plot.
Download annual mean sea level data.

Download metric sea level data. Use only with extreme caution.
NOTE: If some of the data are red in the plots above, the 'flag for attention' is set. Please see the documentation below.

Additional Data Sources (guide to additional data sources)

Nearby GNSS Stations from SONEL: P106

Station Documentation

Link to RLR information.

Documentation added 1991-06-11

Soma 642/036 RLR(1974) is 11.0m below BM Attach-27

Documentation added 2009-11-17

The relevant authority for this station is the Geographical Survey Institute. For some reason the data for 1998 was not downloaded from this authority. Data downloaded and entered 17.11.09.

Documentation added 2012-02-22

A massive earthquake of magnitude 9.0 occurred at 14.46 JST (05.46 UTC) on Friday 11th March 2011 with the epicentre situated approx. 70km east of the Oshika Peninsula of Tohoku. It was the largest earthquake to strike Japan and triggered a tsunami with waves of up to 40.5m and travelling inland up to 10km. From the data plot it is obvious that the tide gauge was probably destroyed. Data following the earthquake has been flagged.

Documentation added 2014-03-13

The GPS benchmark information has been downloaded from the SONEL website. GPS benchmark P106 is 14.116m above RLR.

Documentation added 2016-03-16

Although data following the earthquake has been flagged it now looks as if a replacement gauge could have been installed. Until further information is available the datapoints remain flagged but will be reviewed in the future.

Data Authority

Geographical Survey Institute
Kitasato -1
Tsukuba-shi
Ibaraki-ken 305